It would have been the first time Midazolam had been used since it went all the way to the U.S. Supreme Court.

But, a drug mix-up in McAlester postponed everything for Glossip.

“One of the things the United States Supreme Court said in Glossip is the plaintiffs, the death row inmates, would have to provide the court with an alternative method of execution which was less painful,” said legal analyst David McKenzie.

The Ohio inmates did that, pointing to a compounded dose of Pentobarbital.

Oklahoma used a form of the drug before officials couldn’t get their hands on any more and switched to Midazolam.